YMA circular electrical connectors are commonly used for outdoor electrical signal connections on ship decks, made of stainless steel to prevent long-term immersion in saltwater, collisions on the deck, and can withstand a water seal underwater up to 50 meters for a short period after the plug and socket are mated. They are焊接式 connected to cables and feature five different key positions to prevent incorrect insertion. The contact pieces use high-reliability double-curved spring sockets for smooth insertion and removal. The direction of power transmission is not fixed; it is recommended to install the power source at one end of the socket to avoid electric shock.